Remove #pragma once from ash

ash/test/capture_tracking_view.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_TEST_CAPTURE_TRACKING_VIEW_
 #define ASH_TEST_CAPTURE_TRACKING_VIEW_
-#pragma once
 
 #include "base/compiler_specific.h"
 #include "ui/views/view.h"
 
 namespace ash {
 namespace test {
 
 // Used to track OnMousePressed() and OnMouseCaptureLost().
 class CaptureTrackingView : public views::View {
  public:
@@ skipping 17 matching lines @@
   bool got_press_;
   bool got_capture_lost_;
 
   DISALLOW_COPY_AND_ASSIGN(CaptureTrackingView);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_CAPTURE_TRACKING_VIEW_